.view{
  margin:20px auto 0;
  width: 600px;
  height: 500px;
  position: relative;
  border: 2px solid #000;
}

.ball{
  width: 60px;
  height: 60px;
  background: rgba(33, 33, 33, 0.5);
  border-radius: 100%;
  position: absolute;
  top: 151px;
  left:400px;
}

.fixed-ball{
  width: 80px;
  height: 80px;
  background: rgba(66, 99, 66, 0.5);
  border-radius: 100%;
  position: absolute;
  left:260px;
  top: 210px;
}